Traction-spur for motor-vehicle wheels.



W. VLASAK. TRACTION SPUR FOR moms VEHICLE WHEELS. APPLICATION FILED OCT. 3, I917.

Patented May 6, 1919.

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mamas filed October a, 1917. Serial No. new.

To all :whomjz't may concern:

Be it known that I, WILLIAM Vmsax a citizen of the United States, residing at 'Chicago, in the county of Cook and State of Ill1nois, have invented new and useful Im-" rovements in Traction-S ms for Motorehicle Wheels, of which t e following is a specification.

This invention relates to devices designed to be attached tomotor vehicle wheels for extricating the car out of mud or sand'holes. It is the object of the present invention to.

provide an improved traction spur for the purposestated, which is highly efiicient in operation, and which can be readily attached to the wheel and removed therefrom. The object stated is attained by means of a novel combination and. arrangement of parts to be hereinafter described and claimed, and in order that the same may be better understood, reference is bad to the accompanying drawing forming a part of this specification.

-In the drawing,

Figure 1 is a erspective view showing the application of the' invention;

Fi 2 is across section of the tire, showin t e device in place thereon, and

ig. 3 is a perspective view showing a modified detail.

Referring specifically to the drawing, 5 denotes a fragment of a motor wheel, ro-

. vided with a pneumatic tire 6 mounte on the rim of the wheel in the ordinary manner. The traction spur or shoe which is the subject matter of the present application for patent is shaped to fit the tread of the tire 6, and it is composed of a solid block or casting 7 which is concave at the bottom to fit the tire. Intermediate its ends, the block has a transverse outstanding traction rib or spur 8 having a slight incline forward or in the direction of travel, and tapered outward to a sharp edge 9 ex'tendingatransversely, of the tire. The intermediate portion of the block from which the traction spur extends is thickened to obtainthe necessary strength and rigidity, and it also projects at its sides from the sides of the tire, as shown at 10, the

projecting ends having apertures through which retaining members pass. One of these Specification of Letters Patent.

rod 12 is threa Patented May 6, 1219- retaining members is a bolt 11 and the other the outer surface of the part 10 and a nut 1 6 screwed on the bolt engages the under side of the clig (plate 14. One end of the e to receive a nut 17 which 18 screweddown against the part 10, and the other end of the rod is formed with a hook 18 which is passed throu the aperture in the clip plate 14. The 1'0 12 is on the inner side of the wheel, and ordinarily it is not necessary to remove the same when the at taohment is to be taken ofi the wheel. The nut 17 permits adjustment of the rod 12 to accommodate the attachment to tires of different sizes, and the rod may also be removed from the plate 14 to permit the substitution of the clip plate shown in Fig. 3.

To attach the device to the wheel, the bolt 11 is first removed, and the parts 7 and 14 are then set in lace, after which the bolt 11 a is attached an tightened up by the nut 16.

When the wheel .felly has a rib on its under side, the plate 14' will be made with a depression 19, as shown in Fig. 3, to accommodate said rib.

In use, the device being in place on the wheel, the traction rib or spur 8 is driven into themud or sand when the wheel turns,

thereby extricating the car.

I claim a A traction s ur for vehicle wheels, comprising a. solid lock havin a concave under side to fit a tire tread, an provided with a top transverse traction rib, said block also having an elongated extension projecting from one side of the spur and another extension projecting from the other side of the spur, said last-mentioned extension carrying means for anchorin the block to the wheel against outward r ial displacement.

In testimony whereof I aflix my signature.

WILLIAM VLASAK.

copies or this patent may be obtllned for its cents each, by addressing the "Oommluioner of Iotentn,

Washington, D. 0.? 

